19
LRS 1-50 - USA - Installation & Operating Manual -
850704-01
In the control cabinet: Electrically connecting the conductivity switch
Supply voltage connection
The equipment is supplied with 24 V DC (PELV / CLASS2) and has an external 0.5A medium time-
lag fuse. Please use a safety power supply unit with protective electrical isolation.
This power supply unit must provide a level of isolation against dangerous contact voltages that
at least meets the requirements for double or reinforced insulation in accordance with standard
UL 60730-1.
Connecting the output contacts
Connect the upper terminal strip
1
(terminals 16-23) according to the desired switching functions.
Provide the output contacts with an external 2.5A slow blow fuse.
Switching off inductive loads produces surges that can have a major adverse effect on open and
closed-loop control systems. Connected inductive loads must therefore have interference sup-
pression (RC combination) as specified by the manufacturer.
If used as a conductivity limiter, the LRS 1-50 conductivity switch does not interlock automatically
when the MAX limit is exceeded.
If the installation requires an interlock, this must be implemented in the downstream (safety)
circuit.
Connecting the LRG 16-4 conductivity electrode
Use a shielded TC-ER control cable with minimum wire size AWG18 e.g., OELFLEX CONTROL TM
CY 3G1, to connect the equipment.
Connect the terminal strip as shown in the wiring diagram in
Fig. 3.
Connect the shield to the central grounding point (CGP) in the control cabinet.
Route the connecting cable between items of equipment separately from power lines.
Connecting the LRG 16-9 conductivity electrode
The LRG 16-9 conductivity electrode is equipped with an M12 A-coded, 5-pole sensor connector,
see
Fig. 3
for assignment. A pre-wired control cable (with connector and socket) is available in
various lengths as an accessory for connecting the equipment.
To connect the LRS 1-50 conductivity switch, please remove the connector and wire the terminal
strip as shown in the wiring diagram in
Fig. 3.
Generalized wire colors cannot be provided here,
because the cables originate from different manufacturers. Please take the cable pin assignment
into consideration before connection.
Connect the shield to the central grounding point (CGP) in the control cabinet.
If you are not using the pre-wired control cable, lay a shielded TC-ER control cable with minimum
wire size AWG18, e.g., OELFLEX CONTROL TM CY 5G1, as a connecting cable. In addition, connect
a socket, e.g., Binder series 713 99-0436-58-05, to the control cable at the electrode end.
Route the connecting cable between items of equipment separately from power lines.
Attention
■
Do not use unused terminals as support terminals.
